Automatic electric fire-alarm



(No Model,) 2 Sheets-Sheet 1. H. A. OLSSON.

AUTOMATIC ELECTRIC FIRE ALARM.

No. 605,795. Patented June 14,1898.

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' 2 Sheets-Sheet 2.

(No Model.)

H. A. 0LSSON.. AUTOMATIC ELECTRIC FIRE ALARM.

Patented June" 14,- 1898.

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UNITED STATES PATENT Frrcn.

HERMANA. .oLsso or owner, MASSACHUSETTS.

AUTOMATIC ELECTRIC FIRE-ALARM.

SPECIFICATION forming part of Letters Patent No. 605,? 95, dated June 14, 1898. Application filed .Iuuc 1731897. Serial No. 641,135. (No model.)

T0 aZZ whom it may concern:

Be it known that I, HERMAN A. QLSSON, a citizen of Sweden, and a resident of Quincy, in the county of Norfolkand State of Massachusetts, have invented new and useful Improvements in Automatic Electric Fire-- Alarms, of which the following, taken in con-' nection with the accompanying drawings, is a specification.

This invention relates to improvements in automatic electric fire-alarms for the purpose of notifyingthe occupants of a house of a fire occurring in any one of the rooms in the building, and it is so constructed as toauto'matic'-" ally sound an alarm to indicate in which of the rooms of the house the fire is started, thus enabling the occupants to concentrate their efforts on such room in extinguishing the fire.

If so desired, the automatic alarm may-be connected to neighboringhouse s orbuildings,

so as to notify the occupants of such adjacent buildings in case the persons in the building on fire should be absent, as will hereinafter be more fully shown and described, reference being had to the accompanying draw ings, wherein- Figure 1 represents a diagram showing thecircuit-interrupters, alarms, and fusible cords arranged in a series of rooms or apartments in a house or building. Fig. 2 represents a detail side elevation of one of the circuit-in terrupters. Fig. 3 represents a top planview of Fig. 2. Fig. 4 represents a cross-section on the line 4 4:, shown in Fig. 3; and Fig. 5 represents a detail interior view of one of the alarms. v Similar letters refer to similar parts wher ever they occur on the different parts of the drawings.

sent a series of rooms in a house or building. In each such room is located an electric-cir-i cuit interrupter B and an alarm C, electric-f1. ally connected to other similar instruments in the otherv rooms, as well asto a battery'or; electric-current generator D, as showng' Each circuit-interrupteris provided'with'a, spring-actuated shaft or barrel 6, to which is attached a spring I), having its other end attached' to the'casefB. I In practiceagear b? is attached to the shaft b, with its teeth intermeshing in a pinion b fora purpose as will hereinafter be described,

and to said shaft is also secured a pulley 19 to which one end of a fusible cord E is attached. The other end of said cord is attached 'to any stationary object within the room after being guided in various directions within said room, as indicated in Fig. 1.

I use a spring-pressed lever F, having atooth or projection f, normally held in yielding contact with the diskb, as shown. Each lever F has in its free end an electrode or contactpoint'iffl' which isnormally held out of contact with an insulated electrode G, preferably attached to thecase B, as shown.

- I'wish't'o'stat that I do not desire to con- ;fi'ne} myself to any particular clock mechanism for rotating the toothed or notched disk 5 as this may be done in any well-known manner and by means of any suitable clock without departing from the essence of my invention. f

In each room is located, as before stated, an alarm O, which may be of any well-known form. I have shown in the drawings, Fig. 5,

such alarm as consisting of an electromagnet LG; and a pivoted armature 0, provided with a hammer 0 adapted to strike a bell G when the circuit is closed through the electromagnet." Normally the hammer O is held from contact with the hell by means of a suitable [spring 0 as is common in devices of this kind." In the drawings, Fig. 1, A A" A A repre The notched wheel or disk 6 in each room is mad e'different from the others in the arrangement of its teeth or notches. Thus,.for instance, said disk in the room A is provided ,with notches so as to intermittently close and op'enthe circuit to sound an alarm 3 2 when its clock mechanism is released. Another may be arranged to sound 2 3, .1 2, 1

4, and so on through the different rooms.

From the battery or current-generator D leads a wire H'to'the insulatedelectrodes G on the interrupters B B B B in the series, as shown in'Fig. 1. From the other pole of the battery or current-generator D leads a wire I to and through the spools of the electromagnets in the series of alarms C O O C, as shown in Fig. 1.

The movable electrodes f f f f are electrically connected by means of a wire K, said wire being also electrically connected to and through the electromagnets on the alarm, as shown in Fig. 1.

The fusible cord E is preferably made of hemp, cotton, or other suitable combustible material; but, if so desired, it may be made of metal provided at intervals with fusible metal couplings or connections, as is common in automatic electric fire-alarms.

From the above it will be seen' that if a fire should occur in one of the roomsfor instance, room Athe cord E when burned off will release the spring-actuated notched disk Z),

which will be caused to rotate in the direction shown by arrow in Fig. 2, causing the circuit to be alternately closed and opened through all the alarms in the circuit, by which the alarm 3 2 is sounded not alone in the room where the fire occurs, but as well in all the other electrically-connected rooms, thus notifying the occupants of room A that there is a fire in said room and also automatically notifying the occupants of rooms A A A", the. that there is a fire in room A. Likewise, if a fire should occur in room A, as soon as its cord E is burned off or released by the heat the alarm E3 3 will be automatically sounded in said room and all the other electrically-connected rooms, by which notice is given by the alarm to the occupants of all the rooms that there is a fire in room A, and so on. Thus the occupants of a house, hotel, or other building are automatically notified in what particular room or portion of the building the fire is, and they may therefore be enabled to act accordingly either in aiding to put out the fire or escape from the building, as may be most desirable. lly this arrangement great assistance is rendered the firemen in locating a fire in a building, as by the number of the alarm sounded they will know exactly in what room or portion of the building the lire is raging.

Having thus fully described the nature, construction, and operation of my invention, I wish to secure by Letters Patent and claim- In an antomatic-electric-iire-alarm system in combination, an electric-current generator, a series of current-interrupters and alarms electrically connected to the current-generator one in each room of the building, each such current-interruptcr having a spring-aetuated circuit breaking and closing disk differing from the others in the series and a fusible cord or wire for normally holding such disk stationaryand to cause it to be released when said cord or wire is ignited or fused by which the circuit is alternately closed and opened to cause an alarm corresponding to the number of the room in which the fire occurs to be automatically sounded in all the other rooms in the circuit substantially as and for the purpose set forth.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, on this 12th day of. June, A. D. 1807.

HERMAN A. ()l... SON. lVitnesses:

ALBAN Axnnnk, LAURITZ N. Momma. 

